1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Taya2010 [7]
3 years ago
13

Say a hacker has a list of n distinct password candidates, only one of which will successfully log her into a secure system. a.

If she tries passwords from the list at random, deleting those passwords that do not work, what is the probability that her first successful login will be (exactly) on her k-th try?
Mathematics
1 answer:
alexdok [17]3 years ago
7 0

Answer:

The probability is \frac{1}{n}

Step-by-step explanation:

If she has n distinct password candidates and only one of which will successfully log her into a secure system, the probability that her first first successful login will be on her k-th try is:

If k=1

P = \frac{1}{n}

Because, in her first try she has n possibles options and just one give her a successful login.

If k=2

P=\frac{n-1}{n} *\frac{1}{n-1} =\frac{1}{n}

Because, in her first try she has n possibles options and n-1 that are not correct, then, she has n-1 possibles options and 1 of that give her a successful login.

If k=3

P=\frac{n-1}{n} *\frac{n-2}{n-1} *\frac{1}{n-2} = \frac{1}{n}

Because, in her first try she has n possibles options and n-1 that are not correct, then, she has n-1 possibles options and n-2 that are not correct and after that, she has n-2 possibles options and 1 give her a successful login.

Finally, no matter what is the value of k, the probability that her first successful login will be (exactly) on her k-th try is 1/n

You might be interested in
You are offered two jobs. One with a yearly salary of $51,592, and the other an hourly
Crazy boy [7]
You will make 11588 mor dollars for the hourly job
4 0
3 years ago
Needs help fast, I can’t get the right answer
satela [25.4K]

9514 1404 393

Answer:

  2/3

Step-by-step explanation:

The ratio of any corresponding coordinates will give the scale factor.

Using the x-coordinates of C' and C, we have ...

  scale factor = C'/C = 4/6 = 2/3

The dilation scale factor is 2/3.

6 0
2 years ago
What is 159as a percent
11Alexandr11 [23.1K]

Answer:

159 as a percent = 15900%

Brainiest if helpful!

Step-by-step explanation:

To convert 159 to percent multiply 159 by 100. The result is 15900 percent, or, using the percent sign, 15900 %. Put simply, to change 159 to % move the ″.″ two places to the right.

5 0
3 years ago
Read 2 more answers
Given y = 2(x-3) and a domain of (-3,-2 and 5). Find the range.
alexandr402 [8]
The answers are (-3,-12), (-2,-10), (5,4)
4 0
3 years ago
Reynard and his friends visited an orchard on Sunday. They picked 12.34 pounds of apples and
Naddik [55]
21.9 pounds

12.34+9.56=21.9
6 0
1 year ago
Other questions:
  • Which is the graph of the linear equation 1/2x-2y>-6
    5·1 answer
  • What’s the inverse of 2(x-2)^2 = 8(7+y)
    12·1 answer
  • Find the value of x in the isosceles trapezoid below?
    10·1 answer
  • What is -4=r/20-5? <br> Is it r=20
    7·1 answer
  • If the temperature is 30°C, what is it in Fahrenheit?
    15·2 answers
  • The time of a race is 13.7seconds rounded to 1 decimal place.If the time was x seconds find the inequality in x
    7·1 answer
  • On the practice assignment-Model: The pool table problem, how do you solve 1E because I already seem to be making a perpendicula
    6·1 answer
  • What is the slope of this equation, v=3x+60
    9·2 answers
  • Couldn't show it all but help​
    6·1 answer
  • Kelly has some money. She spends $17.50 on clothes,
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!